import React, { Component } from 'react'
import './index.css'
export default class Item extends Component {
    //标识鼠标移入移出
    state ={mouse:false}
    //鼠标移入移出的回调
    handleMouse=(flag)=>{
        return()=>{
            this.setState({mouse:flag})
        }
    }
    //勾选,取消勾选某一个todo的回调
    handleCheck=(id)=>{
        return(event)=>{
            this.props.updateTodo(id,event.target.checked)
        }
    }
    //删除一个todo的回调
    handleDelete=(id)=>{
        if(window.confirm('确定删除吗？')){
			this.props.deleteTodo(id)
		}
    }
    render() {
        const {id,name,done}= this.props
        const {mouse} = this.state
        return (
            <li style={{backgroundColor:mouse ? '#ddd' : 'white'}} onMouseLeave={this.handleMouse(false)} onMouseEnter={this.handleMouse(true)}>
                <label>
                    <input type="checkbox" checked={done} onChange={this.handleCheck(id)}/>
                    <span>{name}</span>
                </label>
                <button onClick={()=>this.handleDelete(id)} className="btn btn-danger" style={{ display:mouse?'block':'none' }}>删除</button>
            </li>
        )
    }
}
 